Diesel thermostat definative answer - Page 138

Mike Noc · 22nd May 2015, 19:44

If you are going to remove the old thermostat housing and fit it to the new water pump check the seal - they have a habit of leaking along with the O ring for the pipe.

Personally I'd fit a new 'stat, but each to their own.

Fred7A · 15th August 2015, 19:39

I see there's a huge thread on this subject! My 2003 CDT's temperature never reaches the 9 o'clock position and fluctuates considerably wile driving. As far as I can see from here it needs a new thermostat. Is that the only possible cause, or does anything else need investigating as well?

wullie480 · 15th August 2015, 19:42

Quote:

Originally Posted by Fred7A

I see there's a huge thread on this subject! My 2003 CDT's temperature never reaches the 9 o'clock position and fluctuates considerably wile driving. As far as I can see from here it needs a new thermostat. Is that the only possible cause, or does anything else need investigating as well?

Yes your thermostat is at fault.

You can see the actual temp via the on board diagnostic.

clf · 15th August 2015, 19:43

Quote:

Originally Posted by Fred7A

I see there's a huge thread on this subject! My 2003 CDT's temperature never reaches the 9 o'clock position and fluctuates considerably wile driving. As far as I can see from here it needs a new thermostat. Is that the only possible cause, or does anything else need investigating as well?

check the temp using the on board display, I think the technique is on this thread somewhere. if it is below 80 degrees, then thermostat is most likely issue. inserting the Renault 5 stat will be the quickest and easiest method of finding out if it is another issue with the cooling system. (although I cannot imagine what that would be to cause it to run too cool )

Fred7A · 15th August 2015, 20:17

Wow, those were really quick replies!

I'll look up how to run the on-board display and check it out - many thanks to you both.

wullie480 · 15th August 2015, 20:24

Quote:

Originally Posted by Fred7A

Wow, those were really quick replies!

I'll look up how to run the on-board display and check it out - many thanks to you both.

T-Cut done a thread on it http://www.the75andztclub.co.uk/foru...iagnostic+mode

suzublu · 15th August 2015, 20:28

And a video here

http://www.the75andztclub.co.uk/foru...d.php?t=185808

Fred7A · 16th August 2015, 21:18

Thanks for the guide, it's easy when you know how! I ran the diagnostics and gave the car a quick run up the motorway for a few miles. The temperature stayed in the low 60s most of the time, with 67 the highest. That's a lot lower than it should be, so I'm guessing that confirms the thermostat not working properly.

On the plus side I checked the plenum drain and everything is nice and dry, and I gave my cloudy headlights a good rub-down and polish - still not perfect but definitely improved.

I see there's a system here for thanking other posters, but I can't work out how to use it...

KRISTLEE · 16th August 2015, 21:52

Quote:

Originally Posted by Fred7A

I see there's a system here for thanking other posters, but I can't work out how to use it...

I believe once you have reached 10 posts the clicky button will be available to use for thanking others..

I have recently changed my thermostat out as I had to do the water pump and it's a bit of a pig of a job to be honest even using the excellent guidance on here. Being ambidextrous and a contortionist would be a huge bonus but for us lesser mortals the key is ensuring that your trolley jack can give enough lift when raising the engine so you can get to the bolts easy enough. Also having an E8 torx spanner comes in very handy if you don't have the lift and can't get enough room for sockets.

If it's just the thermostat at fault then if I were you I would just do the in-line mod for the same result needed.

Fred7A · 16th August 2015, 22:36

Unfortunately I don't have the facilities for doing any real work myself, so I'd have to get a garage to do it. As I only bought the car recently I want to get a good service booked in, so my plan is to get the thermostat done at the same time. My local garage is pretty good, but can anyone recommend a Rover specialist near to Southampton?

22nd May 2015, 19:44	#1371
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	If you are going to remove the old thermostat housing and fit it to the new water pump check the seal - they have a habit of leaking along with the O ring for the pipe. Personally I'd fit a new 'stat, but each to their own.

15th August 2015, 19:39	#1372
Fred7A Regular poster Rover 75 Saloon Join Date: Aug 2015 Location: Southampton Posts: 73 Thanks: 15 Thanked 9 Times in 9 Posts	I see there's a huge thread on this subject! My 2003 CDT's temperature never reaches the 9 o'clock position and fluctuates considerably wile driving. As far as I can see from here it needs a new thermostat. Is that the only possible cause, or does anything else need investigating as well?

15th August 2015, 20:17	#1375
Fred7A Regular poster Rover 75 Saloon Join Date: Aug 2015 Location: Southampton Posts: 73 Thanks: 15 Thanked 9 Times in 9 Posts	Wow, those were really quick replies! I'll look up how to run the on-board display and check it out - many thanks to you both.

15th August 2015, 20:28	#1377
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,920 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	And a video here http://www.the75andztclub.co.uk/foru...d.php?t=185808

16th August 2015, 21:18	#1378
Fred7A Regular poster Rover 75 Saloon Join Date: Aug 2015 Location: Southampton Posts: 73 Thanks: 15 Thanked 9 Times in 9 Posts	Thanks for the guide, it's easy when you know how! I ran the diagnostics and gave the car a quick run up the motorway for a few miles. The temperature stayed in the low 60s most of the time, with 67 the highest. That's a lot lower than it should be, so I'm guessing that confirms the thermostat not working properly. On the plus side I checked the plenum drain and everything is nice and dry, and I gave my cloudy headlights a good rub-down and polish - still not perfect but definitely improved. I see there's a system here for thanking other posters, but I can't work out how to use it...

16th August 2015, 22:36	#1380
Fred7A Regular poster Rover 75 Saloon Join Date: Aug 2015 Location: Southampton Posts: 73 Thanks: 15 Thanked 9 Times in 9 Posts	Unfortunately I don't have the facilities for doing any real work myself, so I'd have to get a garage to do it. As I only bought the car recently I want to get a good service booked in, so my plan is to get the thermostat done at the same time. My local garage is pretty good, but can anyone recommend a Rover specialist near to Southampton?